iCE40/ghdl - [no description]

	Commit message (Expand)	Author	Age	Files	Lines
*	update license headers	umarcor	2021-01-14	1	-11/+9
*	Typo fixes in Ada code.	Patrick Lehmann	2021-01-10	1	-2/+2
*	Rework initialization and finalization.	Tristan Gingold	2020-12-30	1	-4/+6
*	libraries: Load_Std_Library: now return a status.	Tristan Gingold	2020-12-26	1	-1/+2
*	vhdl: allows --work between files for -c. Fix #1362	Tristan Gingold	2020-06-09	1	-5/+6
*	Use Decode_Work_Option in options. Factorize code.	Tristan Gingold	2019-10-15	1	-6/+4
*	ghdlsynth: allow --work= option in the middle of files.	Tristan Gingold	2019-10-15	1	-0/+8
*	libraries: add Get_Library_No_Create.	Tristan Gingold	2019-06-24	1	-0/+4
*	vhdl: rename iirs to vhdl.nodes	Tristan Gingold	2019-05-05	1	-1/+1
*	thin.py: add a namespace for Libraries, export Find_Entity_For_Component.	Tristan Gingold	2018-12-18	1	-2/+1
*	Create sem_lib from libraries.	Tristan Gingold	2018-11-14	1	-44/+7
*	libraries: rename Implicit_Location by Library_Location.	Tristan Gingold	2017-10-09	1	-0/+3
*	Add ghdl --find-top command.	Tristan Gingold	2017-07-05	1	-0/+6
*	Fix typo: paths.	Tristan Gingold	2017-05-18	1	-5/+5
*	Finish_Compilation: factorize code, move to libraries.	Tristan Gingold	2016-10-15	1	-0/+4
*	Move Library_To_File_Name from Back_End to Libraries	Tristan Gingold	2016-09-17	1	-0/+6
*	Fix indentation and English mistakes.	Tristan Gingold	2016-07-05	1	-1/+1
*	Move sources to src/ subdirectory.	Tristan Gingold	2014-11-04	1	-0/+188

# Keymap Overview QMK keymaps are defined inside a C source file. The data structure is an array of arrays. The outer array is a list of layer arrays while the inner layer array is a list of keys. Most keyboards define a `LAYOUT()` macro to help you create this array of arrays. ## Keymap and Layers :id=keymap-and-layers In QMK, **`const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS]`** holds multiple **layers** of keymap information in **16 bit** data holding the **action code**. You can define **32 layers** at most. For trivial key definitions, the higher 8 bits of the **action code** are all 0 and the lower 8 bits holds the USB HID usage code generated by the key as **keycode**. Respective layers can be validated simultaneously. Layers are indexed with 0 to 31 and higher layer has precedence. Keymap: 32 Layers Layer: action code matrix ----------------- --------------------- stack of layers array_of_action_code[row][column] ____________ precedence _______________________ / / | high / ESC / F1 / F2 / F3 .... 31 /___________// | /-----/-----/-----/----- 30 /___________// | / TAB / Q / W / E .... 29 /___________/ | /-----/-----/-----/----- : _:_:_:_:_:__ | : /LCtrl/ A / S / D .... : / : : : : : / | : / : : : : 2 /___________// | 2 `-------------------------- 1 /___________// | 1 `-------------------------- 0 /___________/ V low 0 `-------------------------- Sometimes, the action code stored in keymap may be referred as keycode in some documents due to the TMK history. ### Keymap Layer Status :id=keymap-layer-status The state of the Keymap layer is determined by two 32 bit parameters: * **`default_layer_state`** indicates a base keymap layer (0-31) which is always valid and to be referred (the default layer). * **`layer_state`** has current on/off status of each layer in its bits. Keymap layer '0' is usually the `default_layer`, with other layers initially off after booting up the firmware, although this can configured differently in `config.h`. It is useful to change `default_layer` when you completely switch a key layout, for example, if you want to switch to Colemak instead of Qwerty.